/* * Copyright (c) 2006 Darren Tucker. All rights reserved. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include "includes.h" #include #include #include #include #include "log.h" #include "misc.h" #include "servconf.h" #include "sshkey.h" #include "hostfile.h" #include "auth.h" #include "auth-pam.h" #include "platform.h" #include "openbsd-compat/openbsd-compat.h" extern int use_privsep; extern ServerOptions options; void platform_pre_listen(void) { #ifdef LINUX_OOM_ADJUST /* Adjust out-of-memory killer so listening process is not killed */ oom_adjust_setup(); #endif } void platform_post_listen(void) { #ifdef SYSTEMD_NOTIFY ssh_systemd_notify_ready(); #endif } void platform_pre_fork(void) { #ifdef USE_SOLARIS_PROCESS_CONTRACTS solaris_contract_pre_fork(); #endif } void platform_pre_restart(void) { #ifdef SYSTEMD_NOTIFY ssh_systemd_notify_reload(); #endif #ifdef LINUX_OOM_ADJUST oom_adjust_restore(); #endif } void platform_post_fork_parent(pid_t child_pid) { #ifdef USE_SOLARIS_PROCESS_CONTRACTS solaris_contract_post_fork_parent(child_pid); #endif } void platform_post_fork_child(void) { #ifdef USE_SOLARIS_PROCESS_CONTRACTS solaris_contract_post_fork_child(); #endif #ifdef LINUX_OOM_ADJUST oom_adjust_restore(); #endif } /* return 1 if we are running with privilege to swap UIDs, 0 otherwise */ int platform_privileged_uidswap(void) { #ifdef HAVE_CYGWIN /* uid 0 is not special on Cygwin so always try */ return 1; #else return (getuid() == 0 || geteuid() == 0); #endif } /* * This gets called before switching UIDs, and is called even when sshd is * not running as root. */ void platform_setusercontext(struct passwd *pw) { #ifdef WITH_SELINUX /* Cache selinux status for later use */ (void)ssh_selinux_enabled(); #endif #ifdef USE_SOLARIS_PROJECTS /* * If solaris projects were detected, set the default now, unless * we are using PAM in which case it is the responsibility of the * PAM stack. */ if (!options.use_pam && (getuid() == 0 || geteuid() == 0)) solaris_set_default_project(pw); #endif #if defined(HAVE_LOGIN_CAP) && defined (__bsdi__) if (getuid() == 0 || geteuid() == 0) setpgid(0, 0); # endif #if defined(HAVE_LOGIN_CAP) && defined(USE_PAM) /* * If we have both LOGIN_CAP and PAM, we want to establish creds * before calling setusercontext (in session.c:do_setusercontext). */ if (getuid() == 0 || geteuid() == 0) { if (options.use_pam) { do_pam_setcred(use_privsep); } } # endif /* USE_PAM */ #if !defined(HAVE_LOGIN_CAP) && defined(HAVE_GETLUID) && defined(HAVE_SETLUID) if (getuid() == 0 || geteuid() == 0) { /* Sets login uid for accounting */ if (getluid() == -1 && setluid(pw->pw_uid) == -1) error("setluid: %s", strerror(errno)); } #endif } /* * This gets called after we've established the user's groups, and is only * called if sshd is running as root. */ void platform_setusercontext_post_groups(struct passwd *pw) { #if !defined(HAVE_LOGIN_CAP) && defined(USE_PAM) /* * PAM credentials may take the form of supplementary groups. * These will have been wiped by the above initgroups() call. * Reestablish them here. */ if (options.use_pam) { do_pam_setcred(use_privsep); } #endif /* USE_PAM */ #if !defined(HAVE_LOGIN_CAP) && (defined(WITH_IRIX_PROJECT) || \ defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)) irix_setusercontext(pw); #endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ #ifdef _AIX aix_usrinfo(pw); #endif /* _AIX */ #ifdef HAVE_SETPCRED /* * If we have a chroot directory, we set all creds except real * uid which we will need for chroot. If we don't have a * chroot directory, we don't override anything. */ { char **creds = NULL, *chroot_creds[] = { "REAL_USER=root", NULL }; if (options.chroot_directory != NULL && strcasecmp(options.chroot_directory, "none") != 0) creds = chroot_creds; if (setpcred(pw->pw_name, creds) == -1) fatal("Failed to set process credentials"); } #endif /* HAVE_SETPCRED */ #ifdef WITH_SELINUX ssh_selinux_setup_exec_context(pw->pw_name); #endif } char * platform_krb5_get_principal_name(const char *pw_name) { #ifdef USE_AIX_KRB_NAME return aix_krb5_get_principal_name(pw_name); #else return NULL; #endif } /* returns 1 if account is locked */ int platform_locked_account(struct passwd *pw) { int locked = 0; char *passwd = pw->pw_passwd; #ifdef USE_SHADOW struct spwd *spw = NULL; #ifdef USE_LIBIAF char *iaf_passwd = NULL; #endif spw = getspnam(pw->pw_name); #ifdef HAS_SHADOW_EXPIRE if (spw != NULL && auth_shadow_acctexpired(spw)) return 1; #endif /* HAS_SHADOW_EXPIRE */ if (spw != NULL) #ifdef USE_LIBIAF iaf_passwd = passwd = get_iaf_password(pw); #else passwd = spw->sp_pwdp; #endif /* USE_LIBIAF */ #endif /* check for locked account */ if (passwd && *passwd) { #ifdef LOCKED_PASSWD_STRING if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0) locked = 1; #endif #ifdef LOCKED_PASSWD_PREFIX if (strncmp(passwd, LOCKED_PASSWD_PREFIX, strlen(LOCKED_PASSWD_PREFIX)) == 0) locked = 1; #endif #ifdef LOCKED_PASSWD_SUBSTR if (strstr(passwd, LOCKED_PASSWD_SUBSTR)) locked = 1; #endif } #ifdef USE_LIBIAF if (iaf_passwd != NULL) freezero(iaf_passwd, strlen(iaf_passwd)); #endif /* USE_LIBIAF */ return locked; }